THE MAHASKA COUNTY LAND BRIEF
Land in the
Rolling Loess Prairies setting.
Mahaska County has 570.9 square miles of land in Iowa. 2 mapped landscape regions meet across Mahaska County: Rolling Loess Prairies, Loess Flats and Till Plains.
Glacial till plains and windblown loess hills make up the Western Corn Belt landscape. Near-level and rolling terrain are interspersed with steeper river valleys and hills.
Regional context: Western Corn Belt Plains ↗ · Regional mapping across the county footprint
Where the landscape changes
Mahaska County intersects 2 mapped regional units. The largest mapped shares are:
- Rolling Loess Prairies96.8%
- Loess Flats and Till Plains3.2%
Central Irregular Plains in Mahaska County
Irregular plains form a transition between northern agricultural country and more wooded uplands to the south and east. Grassland and forest historically mixed, with wider woodland belts beside streams.
Read the regional source ↗Finding your parcel within Mahaska County
The atlas lists 11 cities, towns, townships, and Census communities associated with Mahaska County, including Pella, Oskaloosa, Eddyville. The list includes overlapping geography types and does not divide the county into exclusive service areas.
Mahaska County by land and water
The Census records 2.55 square miles of water within Mahaska County, or 0.4% of its total area. That share is close to Mahaska County’s 0.4%. This is geographic context; waterfront status and usable land must be checked at the parcel.
For scale, Mahaska County has 70.8 times the land area of nearby Oskaloosa city (8.06 square miles). These areas describe boundaries, not comparable property prices.
The Census boundary meets Jasper County, Keokuk County, Marion County, Monroe County, Poweshiek County, Wapello County within Iowa. A tract near one of these lines should be matched to the county identifier on its own records.

